I don't think they truly appreciate you until they have left home, ruby. Or have children of their own. Also, Mother's Day means nothing to many women, strange though it may seem to the rest of us. My mother isn't at all bothered about it, yet even though she was a pretty dreadful mother, we feel guilty about thinking it, so always send her lovely presents!
as for someone further up the thread suggesting that DiLs should remind the DS's - that is what I always hated about being married/in a relationship. We really shouldn't have to. The whole thing is a circle of guilt, in the end, rather than a spontaneous show of affection. Yet I still find myself wondering whether DS will remember to send me a card, even though I know he has a short-term memory problem, and I certainly can't rely on DBH to remind him because - he can't even remember his own parents' birthdays!
If You ask DBH what date his parents' birthdays are on, all he can tell you is, sometime in March. So how on earth I can expect him to remember Mother's day (we don't have daily papers or watch real time tv) I don't know!